protocol//host:port/pathname#hash?search

function getValueInString(Name)
{
        // Generic function to search for a field in a string containing several
        //  e.g. f1=val1&f2=val2 separated by delimiter "&" or whatever
        var obj = location.search; // ou document.URL // raw source field 
        var search = Name + "="; // search string
        var delimiter = "&"; // delimiter between fields or end of field
        if (obj.length > 0)
        {
                offset = obj.indexOf(search);
                if (offset != -1)
                {
                        // if search exists
                        offset += search.length;
                        // set index of beginning of value
                        end = obj.indexOf(delimiter, offset);
                        // set index of end of value
                        if (end == -1)
                                end = obj.length;
                        return unescape(obj.substring(offset, end));
                }
        }
        return "";
}

  myDate = new Date();
  tomorrowDate = myDate.getDate() + 1;
  myDate.setDate(tomorrowDate);

  // Sets cookie values. Expiration date and path are optional//
  function setCookie(name, value, expire, path)
  {
        // Bien qu'ici on ait un '=' et pas un '+=', positionner plusieurs cookies fonctionne
        document.cookie = name + "=" + escape(value)
                + ( (expire == null) ? "" : ("; expires=" + expire.toGMTString()) ) 
                + ( (path == null) ?  "" : ("; path=" + path) );
  }

  // Notice the use of escape to encode special characters (semicolons, commas, spaces) in the value string.
  //  This function assumes that cookie names do not have any special characters. The following function returns
  //   a cookie value, given the name of the cookie:
  function getCookie(Name)
  {
         var search = Name + "=";
         if (document.cookie.length > 0)
         {
              // if there are any cookies
              offset = document.cookie.indexOf(search);
              if (offset != -1) { // if cookie exists
                   offset += search.length // set index of beginning of value
                   end = document.cookie.indexOf(";", offset); // set index of end of cookie value
                   if (end == -1)
                       end = document.cookie.length;
                   return unescape(document.cookie.substring(offset, end))
              }
          }
   }

   function dumpURL(type)
   {
        /* Affiche les valeurs des variables
         *  dans une fenetre alert si type = "ALERT" et
         * a l'endroit dans la page sinon
         */
        var msg = "";
        var sepNewLine = "--CRLF--"; // Si modif, changer aussi l'expression reg
        var myRegExp = /--CRLF--/g;

        msg = showProps(location, "location", sepNewLine);

        if (type == "ALERT")
                alert(msg.replace(myRegExp , "\n"));
        else
                document.write(msg.replace(myRegExp, "<br>"));
   }

   function showProps(obj, objName, sepNewLine)
   {
        var result = "";
        for (var i in obj)
                result += objName + "." + i + " = " + obj[i] + sepNewLine;
        return result;
   }

Liens utiles (voir ma page de liens) :